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# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
%YAML 1.2
---
$id: http://devicetree.org/schemas/soc/qcom/qcom,smp2p.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Qualcomm Shared Memory Point 2 Point
maintainers:
- Andy Gross <agross@kernel.org>
- Bjorn Andersson <bjorn.andersson@linaro.org>
- Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
description:
The Shared Memory Point to Point (SMP2P) protocol facilitates communication
of a single 32-bit value between two processors. Each value has a single
writer (the local side) and a single reader (the remote side). Values are
uniquely identified in the system by the directed edge (local processor ID to
remote processor ID) and a string identifier.
properties:
compatible:
const: qcom,smp2p
interrupts:
maxItems: 1
mboxes:
maxItems: 1
description:
Reference to the mailbox representing the outgoing doorbell in APCS for
this client.
qcom,ipc:
$ref: /schemas/types.yaml#/definitions/phandle-array
items:
- items:
- description: phandle to a syscon node representing the APCS registers
- description: u32 representing offset to the register within the syscon
- description: u32 representing the ipc bit within the register
description:
Three entries specifying the outgoing ipc bit used for signaling the
remote end of the smp2p edge.
qcom,local-pid:
$ref: /schemas/types.yaml#/definitions/uint32
description:
The identifier of the local endpoint of this edge.
qcom,remote-pid:
$ref: /schemas/types.yaml#/definitions/uint32
description:
The identifier of the remote endpoint of this edge.
qcom,smem:
$ref: /schemas/types.yaml#/definitions/uint32-array
items:
maxItems: 2
description:
Two identifiers of the inbound and outbound smem items used for this edge.
patternProperties:
"^master-kernel|slave-kernel|ipa-ap-to-modem|ipa-modem-to-ap|wlan-ap-to-wpss|wlan-wpss-to-ap$":
type: object
description:
Each SMP2P pair contain a set of inbound and outbound entries, these are
described in subnodes of the smp2p device node. The node names are not
important.
properties:
interrupt-controller:
description:
Marks the entry as inbound; the node should be specified as a two
cell interrupt-controller. If not specified this node will denote
the outgoing entry.
'#interrupt-cells':
const: 2
qcom,entry-name:
$ref: /schemas/types.yaml#/definitions/string
description:
The name of this entry, for inbound entries this will be used to
match against the remotely allocated entry and for outbound entries
this name is used for allocating entries.
'#qcom,smem-state-cells':
$ref: /schemas/types.yaml#/definitions/uint32
const: 1
description:
Required for outgoing entries.
required:
- qcom,entry-name
oneOf:
- required:
- interrupt-controller
- '#interrupt-cells'
- required:
- '#qcom,smem-state-cells'
additionalProperties: false
required:
- compatible
- interrupts
- qcom,local-pid
- qcom,remote-pid
- qcom,smem
oneOf:
- required:
- mboxes
- required:
- qcom,ipc
additionalProperties: false
examples:
# The following example shows the SMP2P setup with the wireless processor,
# defined from the 8974 apps processor's point-of-view. It encompasses one
# inbound and one outbound entry.
- |
#include <dt-bindings/interrupt-controller/arm-gic.h>
shared-memory {
compatible = "qcom,smp2p";
qcom,smem = <431>, <451>;
interrupts = <GIC_SPI 143 IRQ_TYPE_EDGE_RISING>;
qcom,ipc = <&apcs 8 18>;
qcom,local-pid = <0>;
qcom,remote-pid = <4>;
wcnss_smp2p_out: master-kernel {
qcom,entry-name = "master-kernel";
#qcom,smem-state-cells = <1>;
};
wcnss_smp2p_in: slave-kernel {
qcom,entry-name = "slave-kernel";
interrupt-controller;
#interrupt-cells = <2>;
};
};
|
